check out this campaign ad from team obama. >> hi, i'm the national press secretary in obama for america. on tuesday "vanity fair" published an article on the millions of dollars that mitt romney had in tax havens like the bermuda and cayman islands. did he put money there to avoid paying taxes, we don't know he won't release tax returns. >> it may put lew's nomination in jeopardy. very unusual for a cabinet pick. and joining us live from capitol hill. doug, what do we know. >> reporter: and they say that jack lew has been confirmed in various posts and no reason why he shouldn't be again. republicans beg to differ and mounting sentiment his nomination for treasury secretary may be blocked. at the heart of his trouble. a cayman island investment for citigroup. and while they say that lew paid all taxes associated with that account president obama has repeatedly criticized off shore accounts as you just saw during the campaign of 2012, mitt romney's investments in such an account. leading the charge against lew up here is ranking member jeff sessions of alabama and he also criticizes lew